1.0.17: Support pandoc-rfc internal reference syntax [](#label)
Clean up some dead code
README update:

-- mention the occasional need for quotes in YAML
-- some version updates; mention RFC 7328
-- mention the 1.0.17 addition
1.0.18: remove requirement for wget (handle fetching references internally instead)
1.0.19: Fix lines numbers in YAML error messages, adapt table layout to new xml2rfcv2 quirks
1.0.20: For bibliography only, allow magic references of the form [RFC2119] in addition to {{RFC2119}}
Work around an rfc2629.xslt idiosyncrasy
1.0.21: Hijack the previously broken abbrev feature for auto-indexing of certain words.
Example usage for indexing two BCP14 words as subterms under a common term "BCP14":

*[MUST]: BCP14
*[MUST NOT]: BCP14

(This breaks when the search term occurs in a heading.  More general access to xml2rfc indexing is a "to do", anyway.)
Remove dead code (thanks for alerting me to this method, phluid61)